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panying greenhouse gas emissions in the second half of the twentieth century.
So should we pay any attention to those stories that scream out at us from billboards and
television news headlines, claiming that man, with his inexhaustible dependence on oil-
based machinery and ever more sophisticated forms of transport is creating a nightmare
level of greenhouse gas emissions, poisoning his environment and ripping open the ozone
layer? Doubters point to scientific evidence, which can prove that, of all the greenhouse
gases, only two percent come From man-made sources, the rest resulting from natural
emissions. Who, then, to believe: the environmentalist exhorting us to leave the car at
home, to buy re-usable products packaged in recycled paper and to plant trees in our back
yard? Or the sceptics, including, of course, a lot of big businesses who have most to lose,
when they tell us that we are making a mountain out of a molehill? And my own opinion?
The jury’s still out as for as I am concerned!
Questions 21-29 21.As to the cause of global warming, the author believes that … A. occasionally the fact depend on who you are talking to
B. the facts always depend on who you are talking to
C. often the fact depend on which expert you listen to
D. you should not speak to experts
22. More than 80% of the top meteorologists in the United States are of the opinion that... A. global warming should make us lose sleep
B. global warming is not the result oil natural cyclical changes, but man-made
C. the consequences of global warming will be deviating
